‘The Watcher in the Wall’ by Owen Laukkanen

His latest novel, The Watcher in the Wall, follows Kirk Stevens and Carla Windermere of the crime task force as they investigate a case that first seems to be a simple teen suicide.

But the detectives uncover an online club of unhappy teenagers vowing suicide, led by an anonymous presence.

Soon more victims fall – as they will continue to do unless the psychopath leader can be caught.

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Travel to 'Grantchester' this summer

It’s 1957, and Will Davenport has settled into his role as the vicar of Grantchester, preaching to a packed church. But Will’s faith will be thoroughly tested as he and Geordie are reminded once more that there’s darkness lurking in their little corner of Cambridgeshire.